Geology, Mode of Occurrences and X-Ray Diffraction Studies of Cretaceous Phosphatic Nodules, Nambakuruchi Block of Tiruchirappalli District, Tamil Nadu, India
DOI:
https://doi.org/10.48165/Keywords:
XRD, Cretaceous, Phosphatic Nodules, Mineralogy, Occurrence, Tamil NaduAbstract
The Cretaceous phosphatic deposits of Tiruchirappalli district Tamil Nadu is one of the critical exposers in the world. The present studies revealed that the geological set-up, mode of occurrence and mineralogical character based on X-Ray diffraction studies. The basement of the Cretaceous phosphatic deposits is Archean, which is overlain by the Upper Gondwana, followed by the Uttatur, Tiruchirappalli, Ariyalur, Niniyur, Cuddalore, and Alluvium. The phosphatic deposits consist of the Uttatur Group in Karai formation. The type of occurrence of the phosphate is in nodular form exposed on the land with Maruvattur Clay or Karai Shale showing badland topography. The size of nodules varies from sizes 2 to 5 cm width and 6 – 20 cm length with different shapes like circular, cylindrical, conical, rectangular, and elliptical. The surface colour is yellow to ferruginous. The XRD revealed that the CFA is the main phosphate mineral and calcite, quartz, montmorillonite, and hematite are the gangue minerals present in phosphatic nodules.
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Banerjee DM. (1986). Proterozoic and Cambrian phosphorites regional review: India subcontinent; In: Phosphatedeposits of the world, Proterozoic and Cambrian phosphorites (eds) Cook P J and Shergold J H (CambridgeUniversity Press). 1, 70–90.
Blanford HF. (1862). Cretaceous and other rocks of South Arcot and Trichinopoly districts, Madras; Geol. Surv. India Memoir,4, 217.
Govindan A, Yadagiri K, Ravindran C N and Kalyanasundar R. (1998). A field guide on Cretaceous sequences of Tiruchirapalli Area, Cauvery Basin, India; Oil and NaturalGas Corporation Limited, 53 p.
Nagendra R, Nallapa ReddyA. (2017). Major geologic events of the Cauvery Basin, India and their correlation with global signatures e A review, Journal of Palaeogeography, 6(1), 69–83.
Rama Rao L. (1958). Fossil Algae in India; Nature 181, 544–545.
Rao VP, Michard A, Naqvi S W A, Bottcher M E, Krishnaswamy R, Thamban M, Natarajan R and Borole DV. (2002). Quaternary phosphorites off the southeast coast of India; Chem. Geol. 182, 483–502.
Rao, V. P., Dessarkar, P. M., Nagendra, R., and Babu, E. V. S. S. K., (2007). Origin of Cretaceous phosphorites from the onshore of Tamil Nadu, India. Journal of EarthSystem Science, 116(6), 525-536.
Ronov, A.B. and Yaroshevsky, A.A. (1969). In: Chemical composition of the Earth’s crust, American Geophysical Union, Washington DC, 13, 2-7. doi: 10.1029/GM013p0037.
Soudry D and Champetier Y. (1983). Microbial processes in the Negev phosphorites (southern Israel); Sediment. 30, 411–423.
Sundaram R &Rao PS. (1979). Lithostratigraphic classification of Ullatur and Trichinopoly groups of Upper Cretaceous rocks of Tiruchirapalli District, Tamil Nadu. Geological Survey of India, Miscellanceous Publication 45, 111-119.
Venkateshwarlu M, Nagendra R. (2016). Drift of the Indian Plate during Upper Cretaceous: An Appraisal from Magnetic and Biostratigraphic Perspectives of Sediment Outcrop Successions from Ariyalur-cauvery Basin, Southern India (Unpublished report)
Worth, H. (1893). Report on the phosphate deposits of Trichinopoly. G.O No: 821, revenue dept, Govt of Madras.
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